Add SystemUtil for querying common system properties

[clintval]

Functionality pulled from fgbio and dagr.

Which of these would you like as a part of public API?

[codecov-io]

Codecov Report

Merging #59 into master will increase coverage by 0.28%.
The diff coverage is 83.33%.

@@            Coverage Diff            @@
##           master     #59      +/-   ##
=========================================
+ Coverage   93.21%   93.5%   +0.28%     
=========================================
  Files          24      25       +1     
  Lines         825     831       +6     
  Branches       55      59       +4     
=========================================
+ Hits          769     777       +8     
+ Misses         56      54       -2

Impacted Files	Coverage Δ
.../com/fulcrumgenomics/commons/util/SystemUtil.scala	83.33% <83.33%> (ø)
...ulcrumgenomics/commons/async/AsyncWriterPool.scala	100% <0%> (+6%)	⬆️

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[nh13]

@clintval what do you think about these changes? https://github.com/clintval/commons/pull/1. I'm happy to update fgbio and dagr for you.

[clintval]

A+ go for it.

Was going to write tests after the public API was revealed, but thanks for beating me to it!

[clintval]

@nh13, all set. I found a way to have anchored regex matching that is 2.12 and 2.13 compatible. Ping me if you want help with the rest.

[clintval]

I would be interested in seeing this merged as I want to factor this into PicardTask in Dagr.

[nh13]

One suggested change you yourself suggested.

[clintval]

Few changes:

• Copyrights to 2020
• Changed getSystemProperty to safePropOrNone to match the ecosystem of Scala property getters in scala.util.Properties for when you want to get a system property safely (catch security manager exceptions)
• Deleted lazy val OsName as that's in the Scala builtins
• Moved over implementations to other Scala builtins like isLinux, isMac, and propOrNone

[clintval]

@nh13 I think this is merge-ready FYI

[clintval]

If possible, I'd like to find a way to move this along because I also want to use these features for patches to fgbio and dagr. I'm still having difficulty with the occasional core dump on MacOS (10.15.3) due to the Intel infalters/deflaters and want to unblock fulcrumgenomics/dagr#368.